Abstract
The linear chain system cobaltous oxalate dihydrate alpha -CoC2O4.2D2O with a broad peak of magnetic susceptibility around 18 K was investigated by means of neutron diffraction in the temperature range from 1.4 to 293 K. By means of profile analysis the parameters of the nuclear and magnetic structure were refined. Below the Neel temperature TN=6.1+or-0.1 K, three-dimensional antiferromagnetic long-range order exists, corresponding to a collinear magnetic structure with k=(0,1/2,0) and magnetic moments aligned parallel to the a axis. The observed magnetic structure may be described as two interpenetrating antiferromagnetic sublattices belonging to the Shubnikov group Pbc. The temperature dependence of zero-field magnetisation indicates an abrupt first-order-like change at temperatures close to TN and may be associated with exchange-induced lowering of the crystal symmetry. The ordered magnetic moment of Co2+ at saturation amounts to (3.18+or-0.07) mu B. An estimation of the orbital and spin components of the magnetic moment yields the values mu CoL2+=0.8 mu B and mu CoS2+=2.3 mu B.
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